The second last line of help output has a typo in the spelling of "application"
- missing a 'p'.
In Java 8u152 it isn't the second last line, but the same typo exists a few lines from the end.

E.g.:
javapackager -deploy -outdir outdir -outfile outfile -width 34 -height 43
  -name AppName -appclass package.ClassName -v -srcdir compiled
          Generates outfile.jnlp and corresponding outfile.html files in
          outdir for aplication AppName that is started by package.ClassName
          class and has dimensions of 34x43.